avcodec/cavs: Only keep what is needed from IDCTDSP-API

Namely ScanTable.permutated. The rest of the IDCTDSP-API
is unused as cavs has its own idct.

Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/cavs.c

@@ -792,15 +792,14 @@ int ff_cavs_init_top_lines(AVSContext *h)
 av_cold int ff_cavs_init(AVCodecContext *avctx)
 {
     AVSContext *h = avctx->priv_data;
+    uint8_t permutation[64];
 
     ff_blockdsp_init(&h->bdsp);
     ff_h264chroma_init(&h->h264chroma, 8);
-    ff_idctdsp_init(&h->idsp, avctx);
     ff_videodsp_init(&h->vdsp, 8);
     ff_cavsdsp_init(&h->cdsp);
-    ff_init_scantable_permutation(h->idsp.idct_permutation,
-                                  h->cdsp.idct_perm);
-    ff_init_scantable(h->idsp.idct_permutation, &h->scantable, ff_zigzag_direct);
+    ff_init_scantable_permutation(permutation, h->cdsp.idct_perm);
+    ff_permute_scantable(h->permutated_scantable, ff_zigzag_direct, permutation);
 
     h->avctx       = avctx;
     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

libavcodec/cavs.h

@@ -22,12 +22,16 @@
 #ifndef AVCODEC_CAVS_H
 #define AVCODEC_CAVS_H
 
+#include <stddef.h>
+#include <stdint.h>
+
+#include "libavutil/frame.h"
 #include "libavutil/mem_internal.h"
 
+#include "avcodec.h"
 #include "cavsdsp.h"
 #include "blockdsp.h"
 #include "h264chroma.h"
-#include "idctdsp.h"
 #include "get_bits.h"
 #include "videodsp.h"
 
@@ -166,7 +170,6 @@ typedef struct AVSContext {
     AVCodecContext *avctx;
     BlockDSPContext bdsp;
     H264ChromaContext h264chroma;
-    IDCTDSPContext idsp;
     VideoDSPContext vdsp;
     CAVSDSPContext  cdsp;
     GetBitContext gb;
@@ -220,7 +223,7 @@ typedef struct AVSContext {
     int qp_fixed;
     int pic_qp_fixed;
     int cbp;
-    ScanTable scantable;
+    uint8_t permutated_scantable[64];
 
     /** intra prediction is done with un-deblocked samples
      they are saved here before deblocking the MB  */

libavcodec/cavsdec.c

@@ -521,7 +521,7 @@ static inline int dequant(AVSContext *h, int16_t *level_buf, uint8_t *run_buf,
 {
     int round = 1 << (shift - 1);
     int pos = -1;
-    const uint8_t *scantab = h->scantable.permutated;
+    const uint8_t *scantab = h->permutated_scantable;
 
     /* inverse scan and dequantization */
     while (--coeff_num >= 0) {